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https://issues.apache.org/jira/browse/CASSANDRA-14316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-14316:
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Component/s: Coordination
> Read repair mutations should be sent to pending nodes
> -----------------------------------------------------
>
> Key: CASSANDRA-14316
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14316
> Project: Cassandra
> Issue Type: Improvement
> Components: Coordination
> Reporter: Blake Eggleston
> Priority: Major
>
> Since read repair doesn't mirror mutations to pending endpoints, it seems
> likely that there's an edge case that can break the monotonic quorum read
> guarantee blocking read repair is supposed to provide.
> Assuming there are 3 nodes (A, B, & C) which replicate a token range. A new
> node D is added, which will take over some of A's token range. During the
> bootstrap of D, if there's a failed write that only makes it to a single node
> (A) after bootstrap has started, then there's a quorum read including A & B,
> which replicates that value to B. If A is removed when D finishes
> bootstrapping, a quorum read including node C & D will not see the value
> returned in the last quorum read which queried A & B.
> Table to illustrate:
> |state | A | B | C | D|
> |1 begin | | | | pending|
> |2 write |1 | | | pending|
> |3 repair|1|1| | pending|
> |4 joined| n/a |1| | |
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